A visible magnified and simulated nozzle was designed and installed on a winding machine according to the similarity principle of Reynolds number, to study the yarn motion track in hairiness-reducing nozzle. High-spee...A visible magnified and simulated nozzle was designed and installed on a winding machine according to the similarity principle of Reynolds number, to study the yarn motion track in hairiness-reducing nozzle. High-speed photography was used to observe the yam instantaneous motion state in the nozzle. The results show that the yarn motion track seems to be a cylindrical helix which is close to inner wall in the twisting chamber and kept the same with different technical parameters, such as diameter of the twisting chamber and jet pressure in orifices. According to simulation results and reasonable simplification, the motion track equation and the rotational equation of the yarn could be derived. The velocity of the swirl and hairiness is faster than that of the yarn balloon, so there is enough time for hairiness to be wrapped into the main body of yarn and hence the hairiness is reduced.展开更多
In order to improve the quality of yarn,a research was carried out at ring spinning.A modifiedtraveller has been used to reduce the yarn hairiness vastly.According to the statistical analysis ofthe data,it was found t...In order to improve the quality of yarn,a research was carried out at ring spinning.A modifiedtraveller has been used to reduce the yarn hairiness vastly.According to the statistical analysis ofthe data,it was found that the geometrical shape of travellers is the key factor affecting the yarnhairiness at ring spinning.展开更多
基金Tianjin Science and Technology Planning Projects,China(No.04310471)
文摘A visible magnified and simulated nozzle was designed and installed on a winding machine according to the similarity principle of Reynolds number, to study the yarn motion track in hairiness-reducing nozzle. High-speed photography was used to observe the yam instantaneous motion state in the nozzle. The results show that the yarn motion track seems to be a cylindrical helix which is close to inner wall in the twisting chamber and kept the same with different technical parameters, such as diameter of the twisting chamber and jet pressure in orifices. According to simulation results and reasonable simplification, the motion track equation and the rotational equation of the yarn could be derived. The velocity of the swirl and hairiness is faster than that of the yarn balloon, so there is enough time for hairiness to be wrapped into the main body of yarn and hence the hairiness is reduced.
文摘In order to improve the quality of yarn,a research was carried out at ring spinning.A modifiedtraveller has been used to reduce the yarn hairiness vastly.According to the statistical analysis ofthe data,it was found that the geometrical shape of travellers is the key factor affecting the yarnhairiness at ring spinning.
文摘目的：探讨早期子宫瘢痕妊娠（cesarean scar pregnancy,CSP）宫腔压迫止血的方法及其有效性分析。方法：选取2010年1月—2014年12月在我院诊治的31例行宫腔压迫止血的CSP患者,对其临床资料进行回顾性分析。结果：共纳入31例患者,宫腔球囊压迫18例,宫腔填纱压迫13例。宫腔球囊注液量为7~60 m L,平均（26.88±17.72）m L。球囊放置时间为15~91 h,平均（34.94±20.62）h。球囊压迫期间阴道出血量2~360 m L,平均37.00（10.00,81.25）m L。宫腔填纱时间18~72 h,平均（39.15±14.68）h。宫腔填纱压迫期间阴道出血量5~55 m L,平均10.00（7.25,18.75）m L。宫腔球囊压迫成功率为94.4%（17/18）,感染为率11.11%（2/18）;宫腔填纱成功率为92.3%（12/13）,感染率为7.69%（1/13）。结论：CSP治疗中,宫腔球囊压迫、宫腔填纱压迫止血效果可靠、安全,操作简单,值得临床推广。
